<template>
	<view>
		<my-search @click="searchHandler"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{ height: wh + 'px' }">
				<block v-for="(item, index) in cateList" :key="item.cat_id">
					<view class="left-scroll-view-item" :class="{ active: active === index }" @click="switchHandler(index)">{{ item.cat_name }}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item, index) in subCateList" :key="index">
					<view class="cate-lv2-title">/{{ item.cat_name }}</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3, index3) in item.children" :key="index3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{ item3.cat_name }}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
import { getCateList } from '@/api/cate.js';
import mySearch from '@/components/my-search/my-search.vue';
import badgeMix from '@/mixins/tabbar-badge.js';
export default {
	mixins: [badgeMix],
	data() {
		return {
			// 窗口的可用高度 = 屏幕高度 - navigationBar高度 - tabBar 高度
			wh: 0,
			// 分类数据列表
			cateList: [],
			subCateList: [],
			active: 0,
			// 滚动条距离顶部的距离
			scrollTop: 0
		};
	},
	components: {
		mySearch
	},
	onLoad() {
		// 获取当前系统的信息
		const sysInfo = uni.getSystemInfoSync();

		// 为 wh 窗口可用高度动态赋值 50为搜索框的高度
		this.wh = sysInfo.windowHeight - 50;

		// 调用获取分类列表数据的方法
		this.getCateList();
	},
	methods: {
		async getCateList() {
			const { data: res } = await getCateList();
			this.cateList = res.message;
			this.subCateList = this.cateList[this.active].children;
		},
		switchHandler(i) {
			this.active = i;
			this.subCateList = this.cateList[i].children;
			this.scrollTop = this.scrollTop ? 0 : 1;
		},
		gotoGoodsList(item) {
			uni.navigateTo({
				url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
			});
		},
		searchHandler() {
			console.log('-----2');
			uni.navigateTo({
				url: '/subpkg/search/search'
			});
		}
	}
};
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;

	.left-scroll-view {
		width: 120px;
		height: 100%;
		background-color: #f7f7f7;
		.left-scroll-view-item {
			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;

			// 激活项的样式
			&.active {
				background-color: #ffffff;
				position: relative;

				// 渲染激活项左侧的红色指示边线
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}
	.right-scroll-view {
		flex: 1;
		height: 100%;
		.cate-lv2-title {
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list {
			display: flex;
			flex-wrap: wrap;
			.cate-lv3-item {
				width: 33.33%;
				margin-bottom: 10px;
				display: flex;
				flex-direction: column;
				align-items: center;

				image {
					width: 60px;
					height: 60px;
				}

				text {
					font-size: 12px;
				}
			}
		}
	}
}
</style>
